WO2011078396A1 - Method of producing a silicone oil composition - Google Patents

Method of producing a silicone oil composition Download PDF

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Publication number
WO2011078396A1
WO2011078396A1 PCT/JP2010/073669 JP2010073669W WO2011078396A1 WO 2011078396 A1 WO2011078396 A1 WO 2011078396A1 JP 2010073669 W JP2010073669 W JP 2010073669W WO 2011078396 A1 WO2011078396 A1 WO 2011078396A1
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WIPO (PCT)
Prior art keywords
cross
silicone oil
amino
composition
water
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PCT/JP2010/073669
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French (fr)
Inventor
Yoshitsugu Morita
Tadashi Takimoto
Kazuo Kobayashi
Ryuji Tachibana
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Dow Corning Toray Co., Ltd.
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Application filed by Dow Corning Toray Co., Ltd. filed Critical Dow Corning Toray Co., Ltd.
Priority to US13/518,704 priority Critical patent/US20120321679A1/en
Priority to EP10801285.7A priority patent/EP2516515B1/en
Priority to CN2010800581565A priority patent/CN102666668B/en
Publication of WO2011078396A1 publication Critical patent/WO2011078396A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/26—Crosslinking, e.g. vulcanising, of macromolecules of latex
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/06—Preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/38—Polysiloxanes modified by chemical after-treatment
    • C08G77/382—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon
    • C08G77/388—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/05—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
    • C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
    • C08J3/098—Other compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
    • C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/48—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
    • C08G77/50—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • C08J2383/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/14—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/14—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms

Definitions

  • the present invention relates to a method of preparing a silicone oil composition that contains cross-linked silicone particles dispersed in an amino-modified silicone oil.
  • Patent References 1 and 2 disclose a method of preparing a silicone oil emulsion that contains cross-linked silicone particles in silicone oil drops dispersed in water, wherein after dispersing a silicone-oil-containing cross-linkable silicone composition in water, the aforementioned composition is cross-linked. Following this, the desired silicone oil composition that contains cross-linked silicone particles is obtained by removing the water.
  • Patent Reference No.3 discloses a dilantant liquid, which is composed of amino-modified silicone oil and cross-linked silicone particles and is prepared by merely mixing amino-modified silicone oil with cross-linked silicone particles.
  • a inventive method of producing a silicone oil composition which is characterized by removing water after mixing an aqueous suspension of cross-linked silicone particles having an average particle diameter in the range of 0.1 to 500 ⁇ with an aqueous emulsion of an amino-modified silicone oil having an average emulsion particle diameter in the range of 0.05 to 100 ⁇ .
  • a preferable method of the invention is further characterized by removing the water while stirring water-based mixture under reduced pressure with a stirring apparatus that has at least a stirring means that rotates at low speed along the inner wall of a container and a stirring means that rotates at high speed in the interior of the container, after mixing the aqueous suspension of cross-linked silicone particles with the aqueous emulsion of the amino-modified silicone oil.
  • the production method of the invention makes it possible to produce with high efficiency a silicone oil composition having excellent handling property and containing cross-linked silicone oil particles uniformly dispersed in an amino-modified silicone oil.
  • FIG. 1 is a cross-sectional drawing that shows an example of a stirring apparatus used by the production method of the present invention .
  • the aqueous suspension of cross-linked si licone particles used in the present invention comprises cross-linked si licone particles dispersed in water.
  • the suspension is obtained by cross-l inking an aqueous emulsion of a cross-linkable si licone composition.
  • a composition may be one cross-l inkable, e.g., by a hydrosi lylation reaction, a condensation reaction, a reaction conducted with the use of an organ ic peroxide, or with the use of high-energy rays.
  • Compositions cross-l inkable with hydrosi lylation reaction or condensation reaction are preferable.
  • Si l icone particles may be produced in different forms, such as rubber-l ike, gel-like form or in the form of other elastomers.
  • the cross-linked particles may have different shapes such as a spherical shape, a flat shape, or a spindle shape, of which the spherical shape is preferable.
  • the cross-linked sil icone particles may have an average diameter in the range of 0. 1 to 500 ⁇ , preferably in the range of 0. 1 to 200 ⁇ , further preferably, in the range of 0. 1 to 1 00 ⁇ , and most preferably, in the range of 0. 1 to 50 ⁇ .
  • composition comprising at least (A) an organopolysi loxane that has at least two alkenyl groups in each molecu le, (B) an organopolysi loxane that has at least two silicon-bonded hydrogen atoms in each molecule, and (C) a hydrosilylation reaction catalyst.
  • the alkenyl group in component (A) can be exemplified by vinyl, al lyl, butenyl , pentenyl, and hexenyl with vinyl being particularly preferred.
  • the non-alkenyl si l icon- bonded organic groups in component (A) can be exempl ified by monovalent hydrocarbyl groups, e.g.
  • alkyl groups such as methyl, ethyl, propyl, butyl, and so forth; cycloalkyl groups such as cyclopentyl, cyclohexyl, and so forth; aryl groups such as phenyl, tolyl, xylyl, and so forth; aralkyl groups such as benzyl, phenethyl, 3-phenylpropyl, and so forth ; and halogenated hydrocarbyl groups such as 3-chloropropyl, 3,3,3-trifluoropropyl, and so forth.
  • component (A) can be exemplified by straight chain, cycl ic, network, and partial ly branched straight chain, and straight chain and partially branched straight chain are preferred when the formation of an elastomeric si licone powder is sought.
  • Component (A) has a viscosity at 25 °C preferably in the range from 20 to 1 00,000 mPa ⁇ s and particularly preferably in the range from 20 to 1 0,000 mPa ⁇ s.
  • component (B) can also be exemplified by monovalent hydrocarbyl groups exclud ing the same alkenyl group as cited above.
  • the molecular structure of component (B) can be exempl ified by straight chain, cyclic, network, and partial ly branched straight chain.
  • Component (B) has a viscosity at 25 °C preferably in the range from 1 to 1 0,000 mPa ⁇ s.
  • Component (B) is incorporated in an amount sufficient to bring about the crosslinking of the composition under consideration, but its amount of incorporation is not otherwise particularly l imited .
  • component (B) is preferably incorporated in the range from 0.3 to 200 weight parts per 100 weight parts component (A).
  • Component (C) is a hydrosilylation reaction catalyst and is used to promote the crosslinking reaction in the composition under consideration.
  • Component (C) is particularly preferably a platinum catalyst.
  • This platinum catalyst can be exemplified by chloroplatinic acid, alcohol solutions of chloroplatin ic acid, olefin complexes of platinum, alkenyl siloxane complexes of platinum, platinum black, and platinum supported on si l ica.
  • Component (C) is incorporated in a quantity sufficient to promote the crossl inking reaction in the composition under consideration, but its quantity of incorporation is not otherwise particularly limited. In those instances in which a platinum catalyst is used for component (C), component (C) is preferably incorporated in
  • composition d ispersed in water
  • component (C) may be incorporated in the composition in advance and the composition may then be crossl inked, or the crosslinkable si l icone composition, excluding component (C), may be dispersed in water and component (C) may thereafter be added to the water and the composition may then be crosslinked.
  • the use is preferred of a water-based dispersion in which component (C) has been dispersed to an average particle size of not more than 1 ⁇ .
  • the condensation reaction-crossl inkable si l icone compositions can be exempl ified by a composition comprising at least (D) an organopolysi loxane that has at least two si l icon-bonded hydroxyl groups or hydrolyzable groups in each molecu le wherein the hydrolyzable group can be exempl ified by the alkoxy group, oxime group, acetoxy group, aminoxy group, and so forth, (E) a silane-type crossl inking agent that has at least three silicon-bonded hydrolyzable groups, e.g., the alkoxy group, oxime group, acetoxy group, aminoxy group, and so forth, in each molecule, and (F) a condensation reaction catalyst such as an organotin compound, an organotitanium compound, and so forth .
  • D an organopolysi loxane that has at least two si l icon-bonded hydroxyl groups or hydrolyzable groups in each molecu le
  • the alkoxy group for component (D) can be exemplified by methoxy, ethoxy, and methoxyethoxy.
  • the oxime group for component (D) can be exemplified by the dimethyl ketoxime group and the methyl ethyl ketoxime group.
  • the other sil icon-bonded organic groups in component (D) can be exemplified by monovalent hydrocarbyl groups, e.g., alkyl groups such as methyl , ethyl, propyl, butyl, and so forth; cycloalkyl groups such as cyclopentyl , cyclohexyl, and so forth ; al kenyl groups such as vinyl , allyl, butenyl , pentenyl , and hexenyl ; aryl groups such as phenyl , tolyl, xylyl , and so forth; aralkyl groups such as benzyl, phenethyl, 3-phenylpropyl , and so forth; and halogenated hydrocarbyl groups such as 3-chloropropyl, 3,3 ,3-trifluoropropyl, and so forth .
  • alkyl groups such as methyl , ethyl, propyl, butyl
  • component (D) can be exemplified by straight chain, cycl ic, network, and partial ly branched straight chain, and straight chain and partially branched straight chain are preferred when the formation of an elastomeric si l icone powder is sought.
  • Component (D) has a viscosity at 25 °C preferably in the range from 20 to
  • the alkoxy group and oxime group for component (E) can be exemplified by the same groups as already provided above.
  • Component (E) can be exempl ified by methyltri methoxysi lane, vinyltrimethoxysilane, methyltrioximesi lane, and
  • component (E) is incorporated in an amount sufficient to bring about the crosslinking of the composition under consideration, but its amount of incorporation is not otherwise particularly limited. In specific terms, component (E) is preferably incorporated in the range from 0.3 to 200 weight parts per 1 00 weight parts component (D).
  • Component (F) is a condensation reaction catalyst and is used to promote the crossl i nking reaction in the composition under consideration. It can be specifical ly exempl i fied by dibutyltin di laurate, dibutyltin diacetate, tin octenoate, dibutyltin dioctate, tin laurate, tetrabutyl titanate, tetrapropyl titanate, and dibutoxybis(ethyl
  • component (F) is incorporated in an amount sufficient to promote the crosslinking reaction of the composition under consideration, but its amount of incorporation is not otherwise particularly limited.
  • component (F) is preferably i ncorporated in the range from 0.0 1 to 5 weight parts per 100 weight parts component (D) and particu larly preferably in the range from 0.05 to 2 weight parts per 1 00 weight parts component (D).
  • the cross-l inkable silicone composition of the invention can be dispersed in water by means of a Homo Mixer, a padd le mixer, a Henschel mixer, a Homo Disperser, a colloid m ill, a propel ler-type stirrer, a homogenizer, an inline-type continuous emu l si bomb, an u ltrasonic emulsifier, a vacuum kneader, and so forth.
  • water there are no special restrictions with regard to the amount of water needed for d ispersion. It may be recommended, however, that water constitute 5 to 99 wt.%, preferably 1 0 to 80 wt.% of the entire aqueous emulsion .
  • the fol lowing compounds can be added for improvi ng stabi l ity in dispersing the cross-l inkable si l icone composition in water: polyoxyalkylenealkyl ether, polyoxyalkylenealkyl phenol, polyoxyalkylenealkyl ester, polyoxyalkylenesorbitane ester, polyethyleneglycol, polypropyleneglycol , ethylene oxide adducts of diethyleneglycol trimethylnonano!
  • simi lar nonionic surface-active agents hexylbenzene su lfonic acid, octylbenzene sul fon ic acid, decylbenzene su lfonic acid, dodecylbenzene sulfonic acid, cetylbenzene sulfonic acid, myristylbenzene sulfonic acid, sodium salts of the above, or simi lar anionic surface-active agents; octyltrimethyl ammonium hydroxide, dodecyltrimethyl ammonium hydroxide, hexadecyltrimethyl ammonium hydroxide, octyldimethylbenzyl ammonium hydroxide, decyldimethylbenzyl ammonium hydroxide, dioctadecyldimethyl ammon i um hydroxide, beef tal low trimethyl ammon i um hydroxide, coconut oi l trimethyl ammon
  • aforementioned agents should be used in an amount of 0. 1 to 20 parts by wei ght, and preferably, 0.5 to 1 0 parts by weight.
  • some thickeners such as 2- phenoxyethanol, carboxymethyl cel lulose, xanthan gum , or the l ike can be added for improving stabil ity of the aqueous emulsion.
  • the average diameter of the particles of the curable sil icone composition dispersed in water should be in the range of 0. 1 to 500 ⁇ , preferably in the range of 0. 1 to 200 ⁇ , further preferably in the range of 0. 1 to 1 00 ⁇ , and most preferably in the range of 0.1 to 50 ⁇ .
  • the above ranges are recommended because if the particles of the composition dispersed in water have dimensions below the recommended lower limit, it will be difficult to prepare an aqueous emulsion. If, on the other hand, the average diameter exceeds the recommended upper limit, the prepared emulsion will become unstable.
  • An aqueous suspension of cross-linked silicone particles is obtained by cross- linking the cross-linkable composition dispersed in water as described above.
  • Cross- linking can be carried out by heating the emulsion, retaining the emulsion at room temperature, or irradiating the emulsion with high-energy rays.
  • an aqueous emulsion of amino-modified silicone oil is obtained by dispersing amino-modified silicone oil in water.
  • amino-modified silicone oil can be exemplified by a silicone oil having in its molecule a silicon atom bonded to a 2-aminoethyl group, 3-aminopropyl group, N-cyclohexyl-3-aminopropyl group, N-(2-aminoethyl)-3-aminopropyl group, or a similar amino group.
  • the aforementioned amino-modified silicone oils can be dispersed in water by means of a Homo Mixer, a paddle mixer, a Henschel mixer, a Homo Disperser, a colloid mill, a propeller-type stirrer, a homogenizer, an inline-type continuous emulsifier, an ultrasonic emulsifier, a vacuum kneader, and so forth.
  • the amount of water may be used in that case but it is recommended that water constitute 5 to 99 wt%, preferably 10 to 80 wt% of the entire aqueous emulsion.
  • the emulsion may be combined with aforementioned surface-active substances, in particular, with non-ionic surface-active substances.
  • the surface-active substances can be added in an amount of 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight, per 100 parts y weight of the amino-modified silicone oil.
  • the latter can be combined with a thickener, such as 2-phenoxyethanol, carboxymethyl cellulose, xanthan gum, etc.
  • the mixing ratio of the aqueous suspension of the cross-linked silicone particles to the emulsion of the amino-modified si licone oi l used in the manufacturing method of the invention may be preferable, however, that the weight ratio of the cross-l inked si l icone particles to the am ino- modified oi l be in the range of ( 1 : 99) to (50 : 50). If the content of the cross-linked si licone particles exceeds the recommended content, the cross-l inked silicone particles may easily aggregate, and th is may impair its handl ing property of the obtained silicone composition.
  • a stirring apparatus that has at least a stirring means that rotates at low speed along the inner wal l of the container and a stirring means that rotates at high speed in the interior of the container.
  • An example of a stirring apparatus that can be used by the present invention is shown in Figure 1 .
  • the production method according to the present invention wil l be described in detail using Figure 1 .
  • a stirring means 2 stirs the the entire m ixture(4) of the aqueous suspension of the cross-linked si licone particles with the aqueous emulsion of the amino-modified si l icone oil as a whole within a container 1 ; th is stirring i s performed by low-speed rotation along the inner wal l of the container.
  • This stirring means 2 can be exempl ified by an anchor m ixer and by a scraper-equipped anchor mixer.
  • Th stirring means 2 inhibits local stagnation of the water-based emu lsion within the container and thereby makes possible an even and un iform removal of the water from the mixture.
  • This stirring means 2 rotates at low speed, and its rotation rate is preferably in the range from 1 to 500 rpm.
  • the stirring means 3 through its h igh-speed rotation in the interior of the container 1 , forcibly stirs the m ixture therein or the oil composition therein provided by the removal of the water from the mixture.
  • the reasons for the preceding are as fol lows: the efficient removal of the water from the water-based emulsion i s highly problematic when on ly the stirring means 2 is present; when only the stirring means 3 is present, the water-based emulsion 4 is stirred local ly in the vicinity of the stirring means 3, and as a result the efficient removal of the water from the water-based emulsion 4 is highly problematic.
  • Th is stirring means 3 can be exemplified by impel ler-type stirring devices having a padd le or blade— e.g., a fan, propel ler, soft cross, square cross, butterfly, turbine, disc turbine, curved d isc turbine, blade turbine, tilted padd le, disperser, and so forth— mounted on a stirring shaft, and by homomixers compri sing a high-speed rotating turbine blade and a stator.
  • a disperser-mixer is particularly preferred .
  • the stirring means 3 rotates at high speed, and its rotation rate is preferably in the range from 1 ,000 to 20,000 rpm.
  • Water is removed in the production method according to the present invention while stirring the mixture under reduced pressure; however, in order to accelerate water removal, the m ixture is preferably heated to a temperature below 1 00°C and particularly preferably is heated to a temperature in the range from 50 to 90°C. Wh i le the degree of pressure reduction is also not particularly l im ited, 1 00 mmHg and below is preferred and 50 mmHg and below is particularly preferred.
  • the si l icone oi l composition obtai ned by the above-described method comprises cross-l inked sil icone particles un iform ly d ispersed in the am ino-modi fied si l icone oi l .
  • the composition may be prepared in a l iquid form, cream-l ike form, paste- like form, or grease-l ike form . If necessary, the composition can be combined with arbitrary components such as thickeners, fil lers, solvents, pigments, etc.
  • the si l icone oi l composition obtained by the method of the present invention is suitable for use as a cosmetic material or a cosmetic raw material .
  • the cosmetic material may comprise soap, body shampoo, facial cream, or sim i lar cleaning cosmetic; cosmetic water, milky cream cleanser, packs, or sim i lar basic cosmetics; face powder, foundation or simi lar base make-up; lipstick, rouge, eye shadow, eyeliner, mascara, or simi lar eye make-up; man icure related products or similar makeup materials; shampoo, hair rinse, hair treatments, hair set lotion, blow styl ing lotion, hair spray, foam styl ing agent, jet styl ing agent, hair l iquid, hair tonic, hair cream, hair growth accelerator, hair nourishment, hair dye, hair dressing, or simi lar hair cosmetics; perfume, cologne, or ; tooth paste, similar aromatic cosmetics; substances for the bath; hair removal substances; hair removal cream, shaving lotion, antiperspirant, lotion with sun protection, or other specific cosmetic
  • the silicone oi l composition is most preferable for use in basic cosmetics, makeup cosmetics or other skin-related cosmetics.
  • the cosmetics may be water-based solutions, oil-based solutions, emulsions, creams, foams, sem i-sol ids, sol ids, or powders. In addition, they may be in spray form .
  • the cosmetics mentioned above may be combined with other cosmetic raw material components such as carnauba wax, candel illa wax, Japan wax, whale wax, joj oba oi l wax, montan wax, bee wax, lanol in wax, or similar waxes; liquid paraffin, i so-paraffin, hexyl laurate, isopropyl myristate, cetyl myristate, 2-octyl dodecyl myristate, butyl stearate, decyl oleate, 2-octyldodecyl oleate, myristyl lactate, cetyl lactate, acetylated lanol in, stearyl alcohol, cetostearyl alcohol, oleyl alcohol, avocado oil , almond oi l , ol ive oi l, cacao oil, jojoba
  • Camel lia oil squalane, persic oi l, castor oil , mink oi l, cottonseed oil, coconut oi l, egg yolk oi l, pork fat, or other fats and oi ls; polypropylene glycol monooleate, neopentyl glycol-2-ethylhexanoate, and other glycol ether oils; isostearic acid triglyceride, coconut oi l fatty acid triglyceride, and other polyhydric alcohol ester oils; polyoxyethylene lauryl ether, polyoxypropylene cetyl ether, and other polyoxyalkylene ether oils.
  • dimethylpolysiloxane dimethylpolysiloxane, methylphenylpolysiloxane, octamethyltetracyclosiloxane, decamethylcyclopentasi loxane, polyether-modified si licone oils, or similar si l icone oi ls.
  • Other cosmetic raw material components may comprise glycerin, propylene glycol, 1 ,3 -butylene glycol, butylene glycol, polyethylene glycol, sodium d,l-pyrrol idone carboxylate, sod ium lactate, sorbitol, hyaluronate sodium, or similar moisturizers; higher alcohol sulfuric ester, N-acyl glutamate, phosphoric acid ester, or a simi lar anionic surface-active agent, cationic surface-active agent, betaine-type, amino-type,
  • im idazoline-type, lecithin-type, or similar amphoteric surface-active agents polyhydric alcohol ester-based, ethylene oxide condensation-type, and other nonionic surfactants; iron oxides and other colored pigments; zinc oxides, titanium oxides, zirconium oxides, and other white pigments; m ica, talc, cericite, and other pigment extenders; carrageenan, alginic acid, alginic acid salts, gum arabic, traganth gum, pectin, starch, xanthan gum, Guar gum, carboxymethyl cellulose, polyoxyethyleneglycol distearate, sodium
  • polyacrylate polyethylene glycol, or simi lar thickeners
  • 2-hydroxy-4- methoxybenzophenone or benzophenone derivatives
  • 2-(2' -hydroxy-5 ' -methylphenyl)- benzotriazole or other benzotriazole derivatives
  • cinnamon acid ester or other UV absorbers
  • potassium glycyrrhizinate tocopherol acetate, or other anti-inflammatory agents
  • methylparaben butylparaben, or other anticeptic agents
  • triclosan
  • trichlorocarban or other anti-bacterial agents
  • BHA BHA
  • BHT ⁇ -oryzanol
  • glycerin monostearate or other glycerin fatty acid esters
  • sorbitan monopalm itate or other sorbitan fatty acid esters
  • polyoxyethylene cetyl ester or similar polyoxyethylene alkyl ethers
  • polyoxyethylenestearyl ether polyoxyethylene sorbitan monolaurate, or other
  • polyoxyethylene fatty acid esters as well as polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene cured castor oi l, fatty acid alkylol amide, or other non-ionic surface-active agents; stearyltrimethyl ammonium chloride,
  • the si l icone oi l composition can be used for the preparation of a cosmetic material . It is recommended, however, that the content of the oi l recalculated on a solid basis in the cosmetic material be in the range of 0. 1 to 99.9 wt.%, preferably 0.5 to 99 wt.%. If the silicone oil composition is contained in an amount exceeding the recommended upper limit, it will lose its efficiency as a cosmetic material. If, on the other hand, the content of the silicone oil composition is below the recommended lower limit, it will be difficult to improve tactile characteristics of the cosmetic material.
  • the average diameter of cross-linked silicone particles contained in the aqueous suspension was determined as a median diameter which is the particle diameter
  • the aqueous emulsion of the amino-modified silicone oil was measured with a
  • Viscosity of the silicone oil composition was measured by means of an EMD-type viscometer (the product of Tokyo eiki Co., Ltd.) with the use of the 3° x R14 cone.
  • the storage modulus G' (Pa), the loss modulus G" (Pa), and the loss tangent tan ⁇ of the oil composition were measured using an ARES viscoelasticity analyzer from Rheometric Scientific, Inc. The measurement conditions were as follows: room temperature(25°C), 25 mm parallel plates, gap: 0.5 to 0.6 mm, strain: 10%; oscillation rate: 0.01 to 50 Hz.
  • the obtained mixture was then emulsified in a colloid mill, and combined with 27.6 parts by weight of pure water. As a result an aqueous emulsion of a silicone rubber composition was produced.
  • the obtained emulsion was held intact for 1 day at 50°C, and then the silicone rubber composition was cross-linked by a hydrosilylation reaction, whereby an aqueous suspension of spherical silicone rubber particles was produced.
  • the content of silicon rubber particles dispersed in the obtained aqueous dispersion was 63%, and the average diameter of the silicone rubber particles was 2.5 ⁇ .
  • the obtained mixture was emulsified by stirring for 5 min. at a rotational frequency of 2000 rpm and then at a rotational frequency of 500 rpm in a Homo Disperser; 29.2 parts by weight of pure water were added, and after an additional 5 min. of stirring, an aqueous emulsion of an amino-modified silicone oil was obtained.
  • the content of the amino-modified silicone oil was 63 wt.
  • the average diameter of emulsified droplets of the amino-modified silicone oil was 3.3 ⁇ .
  • An aqueous mixture was prepared by mixing 40 parts by weight of the obtained aqueous suspension of the silicone rubber particles with 60 parts by weight of the obtained aqueous emulsion of the amino-modified silicone oil.
  • the obtained aqueous mixture was loaded into a Combi mixer (the vacuum mixer of Model HV-030; product of STM Co., Ltd.). While stirring at an anchor mixer rotation rate of 90 rpm and a disperser mixer rotation rate of 1 ,000 rpm, the water was removed by reducing the pressure wh i le raising the temperature to 75 to 85 °C over 1 to 2 hours and hold ing for 1 hour at 50 mmHg or below.
  • the obtained si l icone oil composition had a weight ratio of the silicone rubber particles to the amino-modified silicone oil equal to 40/60. Properties of the obtained sil icone oil composition are shown in Table 1 .
  • a si licone oi l composition was prepared by mixing silicone rubber particles and amino- modified sil icone oi l in a ratio of 20/80 by the same method as in Practical Example 1 , except that the aqueous suspension of the si l icone rubber particles was added in the amount of 20 parts by weight and the aqueous emulsion of the amino-mod ified si l icone oi l was added in the amount of 80 parts by weight. Properties of the obtained sil icone oi l composition are shown in Table 1 .
  • HLB polyoxyethylene alkyl ether
  • a un iform mixture was prepared by m ixing 90.49 parts by wei ght of a
  • the obtained mixture was then emulsified in a colloid m ill, and combined with 1 33.7 parts by weight of pure water.
  • an aqueous emulsion of the si l icone rubber composition was produced.
  • the obtained emul sion was held intact for 1 week at room temperature, and then the si l icone rubber composition was cross-linked by a condensation reaction, whereby an aqueous suspension of spherical si l icone rubber particles was produced.
  • a sil icone oi l composition was prepared by mixing si licone rubber particles and amino-modified si l icone oi l by the same method as in Practical Example 2, except that the ratio of the si licone rubber particles to the am ino-modified si l icone oi l was 22/78. Properties of the obtained si licone oil composition are shown in Table 1 .
  • HLB polyoxyethylene alkyl ether
  • the aqueous suspension of the si licone rubber particles prepared in Practical Example 1 was air-dried at room temperature during 1 week. As a result, silicone rubber particles having 0.5 wt.% weight loss on heating measured under conditions of 1 05 °C/ 1 hour/ 1 g sample were obtained . Next, 20 parts by weight of the obtained si l icone rubber particles were m ixed for 1 0 min . with 80 parts by weight of the amino-modified si licone oi l obtained in Practical Example 1 . Mixing was carried out with the use of a blade-type stirrer (three-one motor) rotating at a speed of 300 rpm. However, the silicone rubber particles could not be uniformly dispersed in the silicone oil . It could be found by finger touch that the obtained si licone oi l composition contained agglomerated particles.
  • the aqueous suspension of the sil icone rubber particles prepared in Practical Example 1 was air-dried at room temperature during 1 week. As a result, si licone rubber particles having 0. 1 wt.% weight loss on heating measured under cond itions of 1 05°C/ 1 hour/ 1 g sample were obtained. Next, 12.6 parts by weight of the obtained sil icone rubber particles were m ixed for 1 0 min . with 80 parts by weight of the aqueous emulsion of amino-modified si l icone oi l obtained in Practical Example 1 . Mixing was carried out with the use of a blade-type stirrer (three-one motor) rotating at a speed of 300 rpm . As a result, a thin fi lm was formed on the surface of the mixture after drying in air, and one week later the mixture remained non-uniform and contained a large amount of residual water.
  • a blade-type stirrer three-one motor
  • the si licone oi l composition obtained by the method of the present invention contains cross-linked si l icone particles uniformly dispersed in am ino-modified si licone oi l and is characterized by excel lent handli ng properties
  • th is composition is suitable for use as a lubricating agent, an additive to resin, a cosmetic material, a substance for use in medicine, etc.
  • this sil icone oi l composition is prepared from amino-modified sil icone oil, it can be easi ly dispersed in aqueous solvents and strongly adhere to such substrates as skin, hair, and so forth. Therefore, the composition is mostly suitable for use as a cosmetic material, in particu lar hair cosmetics, as it imparts a feel of smooth touch to hair.
  • 2 stirri ng means that rotates at low speed

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Abstract

To provide a method that efficiently produces a silicone oil composition in which cross-linked silicone particles uniformly dispersed in amino-modified silicone oil. This invention is a method of producing a silicone oil composition, characterized by removing water after mixing an aqueous suspension of cross-linked silicone particles having an average particle diameter in the range of 0.1 to 500 µm with an aqueous emulsion of an amino-modified silicone oil having an average emulsion particle diameter in the range of 0.05 to 100 µm.

Description

DESCRIPTION
Title of Invention
METHOD OF PRODUCING A SILICONE OIL COMPOSITION
Technical Field
[0001] The present invention relates to a method of preparing a silicone oil composition that contains cross-linked silicone particles dispersed in an amino-modified silicone oil. Background Art
[0002] Patent References 1 and 2 disclose a method of preparing a silicone oil emulsion that contains cross-linked silicone particles in silicone oil drops dispersed in water, wherein after dispersing a silicone-oil-containing cross-linkable silicone composition in water, the aforementioned composition is cross-linked. Following this, the desired silicone oil composition that contains cross-linked silicone particles is obtained by removing the water.
[0003] However, since the above method is limited only to the use of a silicone oil that does not affect cross-linking of the cross-linkable silicone composition, amino-modified silicone oils could not be used.
[0004] Patent Reference No.3 discloses a dilantant liquid, which is composed of amino-modified silicone oil and cross-linked silicone particles and is prepared by merely mixing amino-modified silicone oil with cross-linked silicone particles.
[0005] However, it was difficult to produce a silicone composition that contained cross-linked silicone particles uniformly dispersed in amino-modified silicone oil by the above method with sufficient efficiency.
[0006] [Patent Reference No. 1] Japanese Unexamined Patent Application Publication
(hereinafter referred to as "Kokai") 2000-281523
[Patent Reference No.2] Kokai 2000-281903
[Patent Reference No.3] Kokai 2003-176415
Summary of Invention
Technical Problems to be Solved
[0007] It is an object of the present invention to provide an efficient method of preparing a silicone oil composition that contains cross-linked silicone particles uniformly dispersed in an amino-modified silicone oil.
Solution to Problems
[0008] The above object is achieved by a inventive method of producing a silicone oil composition, which is characterized by removing water after mixing an aqueous suspension of cross-linked silicone particles having an average particle diameter in the range of 0.1 to 500 μιη with an aqueous emulsion of an amino-modified silicone oil having an average emulsion particle diameter in the range of 0.05 to 100 μιτι.
[0009] A preferable method of the invention is further characterized by removing the water while stirring water-based mixture under reduced pressure with a stirring apparatus that has at least a stirring means that rotates at low speed along the inner wall of a container and a stirring means that rotates at high speed in the interior of the container, after mixing the aqueous suspension of cross-linked silicone particles with the aqueous emulsion of the amino-modified silicone oil.
Advantageous Effects of Invention
[0010] The production method of the invention makes it possible to produce with high efficiency a silicone oil composition having excellent handling property and containing cross-linked silicone oil particles uniformly dispersed in an amino-modified silicone oil. Brief Description of the Drawings
[0011 ] Fig. 1 is a cross-sectional drawing that shows an example of a stirring apparatus used by the production method of the present invention .
Best Mode for Carrying Out the Invention
[0012] The aqueous suspension of cross-linked si licone particles used in the present invention comprises cross-linked si licone particles dispersed in water. Preferably, the suspension is obtained by cross-l inking an aqueous emulsion of a cross-linkable si licone composition. Such a composition may be one cross-l inkable, e.g., by a hydrosi lylation reaction, a condensation reaction, a reaction conducted with the use of an organ ic peroxide, or with the use of high-energy rays. Compositions cross-l inkable with hydrosi lylation reaction or condensation reaction are preferable. Si l icone particles may be produced in different forms, such as rubber-l ike, gel-like form or in the form of other elastomers. The cross-linked particles may have different shapes such as a spherical shape, a flat shape, or a spindle shape, of which the spherical shape is preferable. The cross-linked sil icone particles may have an average diameter in the range of 0. 1 to 500 μηι, preferably in the range of 0. 1 to 200 μηι, further preferably, in the range of 0. 1 to 1 00 μηι, and most preferably, in the range of 0. 1 to 50 μιτι.
[0013] Hydrosi lylation reaction-crossl inkable sil icone compositions can be
exempl ified by a composition comprising at least (A) an organopolysi loxane that has at least two alkenyl groups in each molecu le, (B) an organopolysi loxane that has at least two silicon-bonded hydrogen atoms in each molecule, and (C) a hydrosilylation reaction catalyst.
[0014] The alkenyl group in component (A) can be exemplified by vinyl, al lyl, butenyl , pentenyl, and hexenyl with vinyl being particularly preferred. The non-alkenyl si l icon- bonded organic groups in component (A) can be exempl ified by monovalent hydrocarbyl groups, e.g. , alkyl groups such as methyl, ethyl, propyl, butyl, and so forth; cycloalkyl groups such as cyclopentyl, cyclohexyl, and so forth; aryl groups such as phenyl, tolyl, xylyl, and so forth; aralkyl groups such as benzyl, phenethyl, 3-phenylpropyl, and so forth ; and halogenated hydrocarbyl groups such as 3-chloropropyl, 3,3,3-trifluoropropyl, and so forth. The molecular structure of component (A) can be exemplified by straight chain, cycl ic, network, and partial ly branched straight chain, and straight chain and partially branched straight chain are preferred when the formation of an elastomeric si licone powder is sought. Component (A) has a viscosity at 25 °C preferably in the range from 20 to 1 00,000 mPa · s and particularly preferably in the range from 20 to 1 0,000 mPa · s.
[0015] The non-hydrogen si l icon-bonded organ ic groups in component (B) can also be exemplified by monovalent hydrocarbyl groups exclud ing the same alkenyl group as cited above. The molecular structure of component (B) can be exempl ified by straight chain, cyclic, network, and partial ly branched straight chain. Component (B) has a viscosity at 25 °C preferably in the range from 1 to 1 0,000 mPa · s. Component (B) is incorporated in an amount sufficient to bring about the crosslinking of the composition under consideration, but its amount of incorporation is not otherwise particularly l imited . In specific terms, component (B) is preferably incorporated in the range from 0.3 to 200 weight parts per 100 weight parts component (A).
[0016] Component (C) is a hydrosilylation reaction catalyst and is used to promote the crosslinking reaction in the composition under consideration. Component (C) is particularly preferably a platinum catalyst. This platinum catalyst can be exemplified by chloroplatinic acid, alcohol solutions of chloroplatin ic acid, olefin complexes of platinum, alkenyl siloxane complexes of platinum, platinum black, and platinum supported on si l ica. Component (C) is incorporated in a quantity sufficient to promote the crossl inking reaction in the composition under consideration, but its quantity of incorporation is not otherwise particularly limited. In those instances in which a platinum catalyst is used for component (C), component (C) is preferably incorporated in
-7 -3
an amount that provides from 1 x 1 0 to 1 x 1 0 weight part plati num metal in component (C) for each 1 00 weight parts of the total of components (A) and (B).
[0017] When crosslinking of this composition is to be undertaken with the
composition d ispersed in water, component (C) may be incorporated in the composition in advance and the composition may then be crossl inked, or the crosslinkable si l icone composition, excluding component (C), may be dispersed in water and component (C) may thereafter be added to the water and the composition may then be crosslinked. In the latter case, the use is preferred of a water-based dispersion in which component (C) has been dispersed to an average particle size of not more than 1 μιτι .
[0018] The condensation reaction-crossl inkable si l icone compositions can be exempl ified by a composition comprising at least (D) an organopolysi loxane that has at least two si l icon-bonded hydroxyl groups or hydrolyzable groups in each molecu le wherein the hydrolyzable group can be exempl ified by the alkoxy group, oxime group, acetoxy group, aminoxy group, and so forth, (E) a silane-type crossl inking agent that has at least three silicon-bonded hydrolyzable groups, e.g., the alkoxy group, oxime group, acetoxy group, aminoxy group, and so forth, in each molecule, and (F) a condensation reaction catalyst such as an organotin compound, an organotitanium compound, and so forth .
[0019] The alkoxy group for component (D) can be exemplified by methoxy, ethoxy, and methoxyethoxy. The oxime group for component (D) can be exemplified by the dimethyl ketoxime group and the methyl ethyl ketoxime group. The other sil icon-bonded organic groups in component (D) can be exemplified by monovalent hydrocarbyl groups, e.g., alkyl groups such as methyl , ethyl, propyl, butyl, and so forth; cycloalkyl groups such as cyclopentyl , cyclohexyl, and so forth ; al kenyl groups such as vinyl , allyl, butenyl , pentenyl , and hexenyl ; aryl groups such as phenyl , tolyl, xylyl , and so forth; aralkyl groups such as benzyl, phenethyl, 3-phenylpropyl , and so forth; and halogenated hydrocarbyl groups such as 3-chloropropyl, 3,3 ,3-trifluoropropyl, and so forth . The molecu lar structure of component (D) can be exemplified by straight chain, cycl ic, network, and partial ly branched straight chain, and straight chain and partially branched straight chain are preferred when the formation of an elastomeric si l icone powder is sought. Component (D) has a viscosity at 25 °C preferably in the range from 20 to
1 00,000 mPa · s and particularly preferably in the range from 20 to 1 0,000 mPa · s.
[0020] The alkoxy group and oxime group for component (E) can be exemplified by the same groups as already provided above. Component (E) can be exempl ified by methyltri methoxysi lane, vinyltrimethoxysilane, methyltrioximesi lane, and
vinyltrioximesi lane. Component (E) is incorporated in an amount sufficient to bring about the crosslinking of the composition under consideration, but its amount of incorporation is not otherwise particularly limited. In specific terms, component (E) is preferably incorporated in the range from 0.3 to 200 weight parts per 1 00 weight parts component (D).
[0021 ] Component (F) is a condensation reaction catalyst and is used to promote the crossl i nking reaction in the composition under consideration. It can be specifical ly exempl i fied by dibutyltin di laurate, dibutyltin diacetate, tin octenoate, dibutyltin dioctate, tin laurate, tetrabutyl titanate, tetrapropyl titanate, and dibutoxybis(ethyl
acetoacetato)titanium. Component (F) is incorporated in an amount sufficient to promote the crosslinking reaction of the composition under consideration, but its amount of incorporation is not otherwise particularly limited. In specific terms, component (F) is preferably i ncorporated in the range from 0.0 1 to 5 weight parts per 100 weight parts component (D) and particu larly preferably in the range from 0.05 to 2 weight parts per 1 00 weight parts component (D). [0022] The cross-l inkable silicone composition of the invention can be dispersed in water by means of a Homo Mixer, a padd le mixer, a Henschel mixer, a Homo Disperser, a colloid m ill, a propel ler-type stirrer, a homogenizer, an inline-type continuous emu l si fier, an u ltrasonic emulsifier, a vacuum kneader, and so forth.
[0023] There are no special restrictions with regard to the amount of water needed for d ispersion. It may be recommended, however, that water constitute 5 to 99 wt.%, preferably 1 0 to 80 wt.% of the entire aqueous emulsion . The fol lowing compounds can be added for improvi ng stabi l ity in dispersing the cross-l inkable si l icone composition in water: polyoxyalkylenealkyl ether, polyoxyalkylenealkyl phenol, polyoxyalkylenealkyl ester, polyoxyalkylenesorbitane ester, polyethyleneglycol, polypropyleneglycol , ethylene oxide adducts of diethyleneglycol trimethylnonano! , or simi lar nonionic surface-active agents; hexylbenzene su lfonic acid, octylbenzene sul fon ic acid, decylbenzene su lfonic acid, dodecylbenzene sulfonic acid, cetylbenzene sulfonic acid, myristylbenzene sulfonic acid, sodium salts of the above, or simi lar anionic surface-active agents; octyltrimethyl ammonium hydroxide, dodecyltrimethyl ammonium hydroxide, hexadecyltrimethyl ammonium hydroxide, octyldimethylbenzyl ammonium hydroxide, decyldimethylbenzyl ammonium hydroxide, dioctadecyldimethyl ammon i um hydroxide, beef tal low trimethyl ammon i um hydroxide, coconut oi l trimethyl ammon ium hydroxide, or simi lar cation ic surface-active agents. Most preferable are non ion ic surface-active agents. The
aforementioned agents should be used in an amount of 0. 1 to 20 parts by wei ght, and preferably, 0.5 to 1 0 parts by weight. Furthermore, some thickeners, such as 2- phenoxyethanol, carboxymethyl cel lulose, xanthan gum , or the l ike can be added for improving stabil ity of the aqueous emulsion.
[0024] In the above-described method, the average diameter of the particles of the curable sil icone composition dispersed in water should be in the range of 0. 1 to 500 μιτι, preferably in the range of 0. 1 to 200 μηι, further preferably in the range of 0. 1 to 1 00 μπι, and most preferably in the range of 0.1 to 50 μπι. The above ranges are recommended because if the particles of the composition dispersed in water have dimensions below the recommended lower limit, it will be difficult to prepare an aqueous emulsion. If, on the other hand, the average diameter exceeds the recommended upper limit, the prepared emulsion will become unstable.
[0025] An aqueous suspension of cross-linked silicone particles is obtained by cross- linking the cross-linkable composition dispersed in water as described above. Cross- linking can be carried out by heating the emulsion, retaining the emulsion at room temperature, or irradiating the emulsion with high-energy rays.
[0026] On the other hand, an aqueous emulsion of amino-modified silicone oil is obtained by dispersing amino-modified silicone oil in water. Such amino-modified silicone oil can be exemplified by a silicone oil having in its molecule a silicon atom bonded to a 2-aminoethyl group, 3-aminopropyl group, N-cyclohexyl-3-aminopropyl group, N-(2-aminoethyl)-3-aminopropyl group, or a similar amino group. Specific examples are the following: an amino-modified silicone oil of the following formula:
Figure imgf000009_0001
(where, "p" is 0 or 1; "x" is a positive number; and "y" is 0 or a positive number); an amino-modified silicone oil of the following formula:
Figure imgf000010_0001
(where, "p" is 0 or 1; "x" is a positive number; and "y" is 0 or a positive number); an amino-modified silicone oil of the following formula:
Figure imgf000010_0002
(where, "p" is 0 or 1; "x" is a positive number; and "y" is 0 or a positive number);
an amino-modified silicone oil of the following formula:
Figure imgf000010_0003
(where, "p" is 0 or 1; "x" is a positive number; and "y" is 0 or a positive number); and the aforementioned amino-modified silicone oils where a part of some of methyl groups is substituted with phenyl groups, 3,3,3-trifluoropropyl groups, hydroxyl groups, methoxy groups, or ethoxy groups. Although there are no special restrictions with regard to viscosity of such amino-modified silicone oils at 25°C, it is recommended that this viscosity be in the range of 1 to 100,000,000 mPa-s, preferably in the range of 5 to 1,000,000 mPa-s, and most preferably, in the range of 5 to 100,000 mPa-s.
[0027] The aforementioned amino-modified silicone oils can be dispersed in water by means of a Homo Mixer, a paddle mixer, a Henschel mixer, a Homo Disperser, a colloid mill, a propeller-type stirrer, a homogenizer, an inline-type continuous emulsifier, an ultrasonic emulsifier, a vacuum kneader, and so forth.
[0028] There are no special restrictions with regard to the amount of water that may be used in that case but it is recommended that water constitute 5 to 99 wt%, preferably 10 to 80 wt% of the entire aqueous emulsion. In order to improve stability of the amino- modified silicone oil in water, the emulsion may be combined with aforementioned surface-active substances, in particular, with non-ionic surface-active substances. The surface-active substances can be added in an amount of 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight, per 100 parts y weight of the amino-modified silicone oil. Furthermore, for improving stability of the aqueous emulsion, the latter can be combined with a thickener, such as 2-phenoxyethanol, carboxymethyl cellulose, xanthan gum, etc.
[0029] The average diameter of the emulsified amino-modified silicone oil droplet (= emulsion droplet of amino-modified silicone oil) used in the manufacturing process described above should be in the range of 0.05 to 100 μιη, preferably 0.1 to 100 μπι, and most preferably, 0.1 to 50 μπι. This is because when the emulsion droplets of the amino- modified silicone oil dispersed in water have an average diameter below the
recommended lower limit, it is difficult to prepare an aqueous emulsion. On the other hand, if the diameter of the particles exceeds the recommended upper limit, the emulsion becomes unstable. [0030] There are no special restrictions with regard to the mixing ratio of the aqueous suspension of the cross-linked silicone particles to the emulsion of the amino-modified si licone oi l used in the manufacturing method of the invention. It may be preferable, however, that the weight ratio of the cross-l inked si l icone particles to the am ino- modified oi l be in the range of ( 1 : 99) to (50 : 50). If the content of the cross-linked si licone particles exceeds the recommended content, the cross-l inked silicone particles may easily aggregate, and th is may impair its handl ing property of the obtained silicone composition.
[0031 ] Accordi ng to the manufacturing method of the invention, upon completion of mixing of the aqueous suspension of the cross-l i nked si l icone particles with the aqueous emul sion of the am i no-modified si l icone oi l , water is removed. Water can be removed by drying in air, drying in hot air flow, drying in vacuum, or drying by heating. Especially, in order to prevent undesirable reaction of the amino-modified silicone oil and to improve water-removing efficiency, it is preferable to remove water from the m ixture under reduced pressure by using of a stirring apparatus that has at least a stirring means that rotates at low speed along the inner wal l of the container and a stirring means that rotates at high speed in the interior of the container. An example of a stirring apparatus that can be used by the present invention is shown in Figure 1 . The production method according to the present invention wil l be described in detail using Figure 1 .
ring method of the invention carried out with the use of the apparatus shown in Fig. 1 .
[0032] A stirring means 2 stirs the the entire m ixture(4) of the aqueous suspension of the cross-linked si licone particles with the aqueous emulsion of the amino-modified si l icone oil as a whole within a container 1 ; th is stirring i s performed by low-speed rotation along the inner wal l of the container. This stirring means 2 can be exempl ified by an anchor m ixer and by a scraper-equipped anchor mixer. Th is stirring means 2 inhibits local stagnation of the water-based emu lsion within the container and thereby makes possible an even and un iform removal of the water from the mixture. This stirring means 2 rotates at low speed, and its rotation rate is preferably in the range from 1 to 500 rpm.
[0033] The stirring means 3, through its h igh-speed rotation in the interior of the container 1 , forcibly stirs the m ixture therein or the oil composition therein provided by the removal of the water from the mixture. The reasons for the preceding are as fol lows: the efficient removal of the water from the water-based emulsion i s highly problematic when on ly the stirring means 2 is present; when only the stirring means 3 is present, the water-based emulsion 4 is stirred local ly in the vicinity of the stirring means 3, and as a result the efficient removal of the water from the water-based emulsion 4 is highly problematic. Th is stirring means 3 can be exemplified by impel ler-type stirring devices having a padd le or blade— e.g., a fan, propel ler, soft cross, square cross, butterfly, turbine, disc turbine, curved d isc turbine, blade turbine, tilted padd le, disperser, and so forth— mounted on a stirring shaft, and by homomixers compri sing a high-speed rotating turbine blade and a stator. A disperser-mixer is particularly preferred . The stirring means 3 rotates at high speed, and its rotation rate is preferably in the range from 1 ,000 to 20,000 rpm.
[0034] Water is removed in the production method according to the present invention while stirring the mixture under reduced pressure; however, in order to accelerate water removal, the m ixture is preferably heated to a temperature below 1 00°C and particularly preferably is heated to a temperature in the range from 50 to 90°C. Wh i le the degree of pressure reduction is also not particularly l im ited, 1 00 mmHg and below is preferred and 50 mmHg and below is particularly preferred.
[0035] The si l icone oi l composition obtai ned by the above-described method comprises cross-l inked sil icone particles un iform ly d ispersed in the am ino-modi fied si l icone oi l . The composition may be prepared in a l iquid form, cream-l ike form, paste- like form, or grease-l ike form . If necessary, the composition can be combined with arbitrary components such as thickeners, fil lers, solvents, pigments, etc.
[0036] The si l icone oi l composition obtained by the method of the present invention is suitable for use as a cosmetic material or a cosmetic raw material . The cosmetic material may comprise soap, body shampoo, facial cream, or sim i lar cleaning cosmetic; cosmetic water, milky cream cleanser, packs, or sim i lar basic cosmetics; face powder, foundation or simi lar base make-up; lipstick, rouge, eye shadow, eyeliner, mascara, or simi lar eye make-up; man icure related products or similar makeup materials; shampoo, hair rinse, hair treatments, hair set lotion, blow styl ing lotion, hair spray, foam styl ing agent, jet styl ing agent, hair l iquid, hair tonic, hair cream, hair growth accelerator, hair nourishment, hair dye, hair dressing, or simi lar hair cosmetics; perfume, cologne, or ; tooth paste, similar aromatic cosmetics; substances for the bath; hair removal substances; hair removal cream, shaving lotion, antiperspirant, lotion with sun protection, or other specific cosmetics. The silicone oi l composition is most preferable for use in basic cosmetics, makeup cosmetics or other skin-related cosmetics. The cosmetics may be water-based solutions, oil-based solutions, emulsions, creams, foams, sem i-sol ids, sol ids, or powders. In addition, they may be in spray form .
[0037] In the preparation of the cosmetic material based on the aforementioned silicone oil composition, the cosmetics mentioned above may be combined with other cosmetic raw material components such as carnauba wax, candel illa wax, Japan wax, whale wax, joj oba oi l wax, montan wax, bee wax, lanol in wax, or similar waxes; liquid paraffin, i so-paraffin, hexyl laurate, isopropyl myristate, cetyl myristate, 2-octyl dodecyl myristate, butyl stearate, decyl oleate, 2-octyldodecyl oleate, myristyl lactate, cetyl lactate, acetylated lanol in, stearyl alcohol, cetostearyl alcohol, oleyl alcohol, avocado oil , almond oi l , ol ive oi l, cacao oil, jojoba oil, sesame oil, safflower oi l, soybean oi l ,
Camel lia oil , squalane, persic oi l, castor oil , mink oi l, cottonseed oil, coconut oi l, egg yolk oi l, pork fat, or other fats and oi ls; polypropylene glycol monooleate, neopentyl glycol-2-ethylhexanoate, and other glycol ether oils; isostearic acid triglyceride, coconut oi l fatty acid triglyceride, and other polyhydric alcohol ester oils; polyoxyethylene lauryl ether, polyoxypropylene cetyl ether, and other polyoxyalkylene ether oils.
dimethylpolysiloxane, methylphenylpolysiloxane, octamethyltetracyclosiloxane, decamethylcyclopentasi loxane, polyether-modified si licone oils, or similar si l icone oi ls.
[0038] Other cosmetic raw material components may comprise glycerin, propylene glycol, 1 ,3 -butylene glycol, butylene glycol, polyethylene glycol, sodium d,l-pyrrol idone carboxylate, sod ium lactate, sorbitol, hyaluronate sodium, or similar moisturizers; higher alcohol sulfuric ester, N-acyl glutamate, phosphoric acid ester, or a simi lar anionic surface-active agent, cationic surface-active agent, betaine-type, amino-type,
im idazoline-type, lecithin-type, or similar amphoteric surface-active agents; polyhydric alcohol ester-based, ethylene oxide condensation-type, and other nonionic surfactants; iron oxides and other colored pigments; zinc oxides, titanium oxides, zirconium oxides, and other white pigments; m ica, talc, cericite, and other pigment extenders; carrageenan, alginic acid, alginic acid salts, gum arabic, traganth gum, pectin, starch, xanthan gum, Guar gum, carboxymethyl cellulose, polyoxyethyleneglycol distearate, sodium
polyacrylate, polyethylene glycol, or simi lar thickeners; 2-hydroxy-4- methoxybenzophenone, or benzophenone derivatives; 2-(2' -hydroxy-5 ' -methylphenyl)- benzotriazole, or other benzotriazole derivatives; cinnamon acid ester, or other UV absorbers; potassium glycyrrhizinate, tocopherol acetate, or other anti-inflammatory agents; methylparaben, butylparaben, or other anticeptic agents; triclosan,
trichlorocarban, or other anti-bacterial agents; BHA, BHT, γ-oryzanol, or other antioxidants.
[0039] The following other cosmetic raw material components can also be added when the aforementioned cosmetics are used as hair cosmetics : glycerin monostearate, or other glycerin fatty acid esters; sorbitan monopalm itate, or other sorbitan fatty acid esters; polyoxyethylene cetyl ester, or similar polyoxyethylene alkyl ethers;
polyoxyethylenestearyl ether, polyoxyethylene sorbitan monolaurate, or other
polyoxyethylene fatty acid esters; as well as polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene cured castor oi l, fatty acid alkylol amide, or other non-ionic surface-active agents; stearyltrimethyl ammonium chloride,
behenyltrimewthyl ammonium chloride, or other monoalkyltrimentyl ammonium ch loride; d istearyldimethyl-ammonium chloride, d ibehenyldimethylammonium chloride, and other dialkyld imethyl ammonium chlorides, or sim i lar cationic surface-active agents; amphoteric surface-active agents; methacryl ic radical-polymerizable polymers and their copolymers with si l icone compounds, poly(N-acylalkyleneimine), poly(N- methylpyrrol idone), si l icone resins modified by fluorine-containing organ ic groups or amino groups, unmod ified si l icone resins, or other skin cosmetics; sulfur, selenium sulfate, zinc pyrithione, octopyrox, zinc pyridium- l -thiol-N-oxide, sal icyl ic acid, 2,4,4'- trichloro-2'-hydroxydiphenyl ether, 1 -hydroxy-2-pyridone compounds, and other anti- dandruff agents; squalane, lanol in, perfluoropolyether, cationic polymers, and other tacti le sensation i mprovers; ethanol, isopropyl alcohol, 1 ,3-butylene glycol, ethylene glycol , propylene glycol, glycerin, or other antifreezing agents; ethylenediamine tetraacetate, citric acid, ethane- l -hydroxy- l , l -diphosphonic acid and their salts, or similar chalates; pearl izing agents, pigments, dyes, or other coloring agents; vitamins, nourishing add itives, hormones, fragrants, pH adjusters, sprays, and other components listed in the Encyclopedia of Shampoo Ingredients (Micel le Press, 1 985).
[0040] There are no special restrictions with regard to the amount in which the si l icone oi l composition can be used for the preparation of a cosmetic material . It is recommended, however, that the content of the oi l recalculated on a solid basis in the cosmetic material be in the range of 0. 1 to 99.9 wt.%, preferably 0.5 to 99 wt.%. If the silicone oil composition is contained in an amount exceeding the recommended upper limit, it will lose its efficiency as a cosmetic material. If, on the other hand, the content of the silicone oil composition is below the recommended lower limit, it will be difficult to improve tactile characteristics of the cosmetic material.
Examples
[0041] The method for preparation of the silicone oil composition of the invention will be described in detail using examples. All values of viscosities given in the examples were measured at 25°C. Average diameters of cross-linked silicone particles, average diameters of emulsion droplet of amino-modified silicone oil emulsified in the aqueous emulsion, as well as values of viscosity and of viscoelastic properties of the silicone compositions were measured by the methods described below.
[0042] [Average Diameter of Cross-Linked Silicone Particles]
The average diameter of cross-linked silicone particles contained in the aqueous suspension was determined as a median diameter which is the particle diameter
corresponding to 50% of the cumulative distribution. Measurements were carried out by means of a diffraction-type diameter distribution analyzer Model LA-500 of Horiba Ltd.
[0043] [Average Diameter of Amino-Modified Silicone Oil Emulsion Droplets]
The aqueous emulsion of the amino-modified silicone oil was measured with a
diffraction-type diameter distribution analyzer (Model LA-750 of Horiba Ltd.), and the average diameter of its emulsion droplets was determined as a median diameter (which is the particle diameter corresponding to 50% of the cumulative distribution).
[0044] [Viscosity of Silicone Oil Composition]
Viscosity of the silicone oil composition was measured by means of an EMD-type viscometer (the product of Tokyo eiki Co., Ltd.) with the use of the 3° x R14 cone.
Measurement values were taken after 3 min. rotation with a rotation frequency of 10 rpm. [0045] [Viscoelasticity of Silicone Oil Composition]
The storage modulus G' (Pa), the loss modulus G" (Pa), and the loss tangent tan δ of the oil composition were measured using an ARES viscoelasticity analyzer from Rheometric Scientific, Inc. The measurement conditions were as follows: room temperature(25°C), 25 mm parallel plates, gap: 0.5 to 0.6 mm, strain: 10%; oscillation rate: 0.01 to 50 Hz.
[0046] [Practical Example 1]
A mixture was prepared by mixing 92.10 parts by weight of a dimethylpolysiloxane copolymer which had a viscosity of 400 m-Pa and was capped at both molecular terminals with dimethylvinylsiloxy groups (content of vinyl groups = 1.18 wt.%) with 7.90 parts by weight of a copolymer of dimethylsiloxane and methylhydrogensiloxane which was capped at both molecular terminals with trimethylsiloxy groups and had viscosity of 50 m-Pa (content of silicon-bonded hydrogen atoms = 0.43%). The mixture was then combined with 29.5 parts by weight of a preliminarily prepared aqueous solution obtained by dissolving 1.6 parts by weight of polyoxyethylene alkyl ether (HLB = 14.5) and 1.6 parts by weight of 2-phenoxyethanol in 96.8 parts by weight of pure water. The obtained mixture was then emulsified in a colloid mill, and combined with 27.6 parts by weight of pure water. As a result an aqueous emulsion of a silicone rubber composition was produced.
[0047] The obtained emulsion was further combined with an aqueous emulsion of a platinum catalyst having a main component in the form of a platinum complex of 1,3- divinyl-l,l,3,3-tetramethyl-disiloxane (average diameter of platinum catalyst particle = 0.05 μηι; concentration of metallic platinum = 0.05 wt.%), which was added in such an amount that the content of metallic platinum in weight units was 100 ppm per silicone rubber composition contained in the aforementioned emulsion. The combined
components were uniformly mixed. [0048] The obtained emulsion was held intact for 1 day at 50°C, and then the silicone rubber composition was cross-linked by a hydrosilylation reaction, whereby an aqueous suspension of spherical silicone rubber particles was produced. The content of silicon rubber particles dispersed in the obtained aqueous dispersion was 63%, and the average diameter of the silicone rubber particles was 2.5 μπι.
[0049] Next, 29,5 parts by weight of an aqueous solution preliminarily prepared by dissolving 1.6 parts by weight of polyoxyethylene alkyl ether (HLB = 14.5) and 1.6 parts by weight of 2-phenoxyethanol in 96.8 parts by weight of pure water was added to 100 parts by weight of an amino-modified silicone oil that had a viscosity of 1,200 mPa-s and was represented by the following formula:
Figure imgf000019_0001
The obtained mixture was emulsified by stirring for 5 min. at a rotational frequency of 2000 rpm and then at a rotational frequency of 500 rpm in a Homo Disperser; 29.2 parts by weight of pure water were added, and after an additional 5 min. of stirring, an aqueous emulsion of an amino-modified silicone oil was obtained. In this emulsion, the content of the amino-modified silicone oil was 63 wt., and the average diameter of emulsified droplets of the amino-modified silicone oil was 3.3 μπι.
[0050] An aqueous mixture was prepared by mixing 40 parts by weight of the obtained aqueous suspension of the silicone rubber particles with 60 parts by weight of the obtained aqueous emulsion of the amino-modified silicone oil. The obtained aqueous mixture was loaded into a Combi mixer (the vacuum mixer of Model HV-030; product of STM Co., Ltd.). While stirring at an anchor mixer rotation rate of 90 rpm and a disperser mixer rotation rate of 1 ,000 rpm, the water was removed by reducing the pressure wh i le raising the temperature to 75 to 85 °C over 1 to 2 hours and hold ing for 1 hour at 50 mmHg or below. The obtained si l icone oil composition had a weight ratio of the silicone rubber particles to the amino-modified silicone oil equal to 40/60. Properties of the obtained sil icone oil composition are shown in Table 1 .
[0051 ] A shampoo was prepared by mixing 1 part by weight of this si licone oi l composition with 5 parts by weight of a polyoxyethylene alkyl ether (HLB = 1 4.5), and 94 parts by weight of water. Next, after soaking hair in thi s shampoo, the hair was washed with warm water, and dried. The treated hair appeared to be resistant to tangling and was smooth to touch.
[0052] [Practical Example 2]
A si licone oi l composition was prepared by mixing silicone rubber particles and amino- modified sil icone oi l in a ratio of 20/80 by the same method as in Practical Example 1 , except that the aqueous suspension of the si l icone rubber particles was added in the amount of 20 parts by weight and the aqueous emulsion of the amino-mod ified si l icone oi l was added in the amount of 80 parts by weight. Properties of the obtained sil icone oi l composition are shown in Table 1 .
[0053] A shampoo was prepared by m ixing 1 part by weight of the si l icone oi l composition with 5 parts by weight of a polyoxyethylene alkyl ether (HLB = 14.5), and 94 parts by weight of water. Next, after soaking hair in this shampoo, the hair was washed with warm water, and dried. The treated hair appeared to be resistant to tangling and was smooth to touch.
[0054] [Practical Example 3]
A un iform mixture was prepared by m ixing 90.49 parts by wei ght of a
dimethylpolysiloxane which had a viscosity of 40 m Pa and was capped at both molecular terminals with hydroxyl groups (content of si licon-bonded hydroxyl groups = 3.8 wt.%), 9.5 1 parts by weight of methylhydrogenpolysi loxane which was capped at both molecular terminals with trimethylsiloxy groups and had viscosity of 20 m Pa (content of si l icon-bonded hydrogen atoms = 1 .56%), and 0.86 parts by weight of tin d ioctylate. The mixture was then combined with 53.6 parts by weight of a prel iminari ly prepared aqueous solution obtained by dissolving 1 .6 parts by weight of polyoxyethylene alkyl ether (HLB = 14.5) and 1 .6 parts by weight of 2-phenoxyethanol in 96.8 parts by weight of pure water. The obtained mixture was then emulsified in a colloid m ill, and combined with 1 33.7 parts by weight of pure water. As a result an aqueous emulsion of the si l icone rubber composition was produced. The obtained emul sion was held intact for 1 week at room temperature, and then the si l icone rubber composition was cross-linked by a condensation reaction, whereby an aqueous suspension of spherical si l icone rubber particles was produced.
[0055] A sil icone oi l composition was prepared by mixing si licone rubber particles and amino-modified si l icone oi l by the same method as in Practical Example 2, except that the ratio of the si licone rubber particles to the am ino-modified si l icone oi l was 22/78. Properties of the obtained si licone oil composition are shown in Table 1 .
[0056] A shampoo was prepared by mixing 1 part by weight of the silicone oil composition with 5 parts by weight of a polyoxyethylene alkyl ether (HLB = 14.5), and 94 parts by weight of water. Next, after soaking hair in this shampoo, the hair was washed with warm water, and dried. The treated hair appeared to be resistant to tangl ing and was smooth to touch.
[0057] [Comparative Example 1 ]
The aqueous suspension of the si licone rubber particles prepared in Practical Example 1 was air-dried at room temperature during 1 week. As a result, silicone rubber particles having 0.5 wt.% weight loss on heating measured under conditions of 1 05 °C/ 1 hour/ 1 g sample were obtained . Next, 20 parts by weight of the obtained si l icone rubber particles were m ixed for 1 0 min . with 80 parts by weight of the amino-modified si licone oi l obtained in Practical Example 1 . Mixing was carried out with the use of a blade-type stirrer (three-one motor) rotating at a speed of 300 rpm. However, the silicone rubber particles could not be uniformly dispersed in the silicone oil . It could be found by finger touch that the obtained si licone oi l composition contained agglomerated particles.
[0058] [Comparative Example 2]
The aqueous suspension of the sil icone rubber particles prepared in Practical Example 1 was air-dried at room temperature during 1 week. As a result, si licone rubber particles having 0. 1 wt.% weight loss on heating measured under cond itions of 1 05°C/ 1 hour/ 1 g sample were obtained. Next, 12.6 parts by weight of the obtained sil icone rubber particles were m ixed for 1 0 min . with 80 parts by weight of the aqueous emulsion of amino-modified si l icone oi l obtained in Practical Example 1 . Mixing was carried out with the use of a blade-type stirrer (three-one motor) rotating at a speed of 300 rpm . As a result, a thin fi lm was formed on the surface of the mixture after drying in air, and one week later the mixture remained non-uniform and contained a large amount of residual water.
[0059]
[Table 1 ]
Figure imgf000022_0001
Industrial Applicability
[0060] Since the si licone oi l composition obtained by the method of the present invention contains cross-linked si l icone particles uniformly dispersed in am ino-modified si licone oi l and is characterized by excel lent handli ng properties, th is composition is suitable for use as a lubricating agent, an additive to resin, a cosmetic material, a substance for use in medicine, etc. In particular, since this sil icone oi l composition is prepared from amino-modified sil icone oil, it can be easi ly dispersed in aqueous solvents and strongly adhere to such substrates as skin, hair, and so forth. Therefore, the composition is mostly suitable for use as a cosmetic material, in particu lar hair cosmetics, as it imparts a feel of smooth touch to hair.
Description of the Reference Numbers in Drawing
[0061]
stirri ng apparatus container
2 stirri ng means that rotates at low speed
3 stirring means that rotates at high speed
4 mixture of an aqueous suspension of cross-linked silicone particles with an
aqueous emulsion of amino-modified si licone oil

Claims

1. A method of producing a silicone oil composition, characterized by
removing water, after mixing an aqueous suspension of cross-linked silicone particles having an average particle diameter in the range of 0.1 to 500 μιτι with
an aqueous emulsion of an amino-modified silicone oil having an average emulsion droplet diameter in the range of 0.05 to 100 μιη.
2. The production method according to claim 1, wherein the aqueous
suspension of cross-linked silicone particles is obtained by dispersing a cross- linkable silicone composition in water and cross-linking the dispersed
composition in water.
3. The production method according to claim 2, wherein the cross-linkable silicone composition is cross-linkable by a hydrosilylation reaction or a condensation reaction.
4. The production method according to claim 1, wherein viscosity of the
amino-modified silicone oil at 25°C ranges from 1 to 100,000, 000 mPas.
5. The production method according to claim 1, wherein the weight ratio of the cross-linked silicone particles to the amino-modified oil ranges from 1 : 99 to 50 : 50.
6. The production method according to claim 1, which is further characterized by removing the water while stirring water-based mixture under reduced pressure with a stirring apparatus that has at least a stirring means that rotates at low speed along the inner wall of a container and a stirring means that rotates at high speed in the interior of the container, after mixing the aqueous suspension of cross- linked silicone particles with the aqueous emulsion of the amino-modified silicone oil. The production method according to claim 6, wherein a stirring means that rotates at low speed along the inner wal l of a container is an anchor blade.
The production method according to claim 6, wherein a stirring means that rotates at high speed in the interior of the container is a dispersion m ixer.
PCT/JP2010/073669 2009-12-22 2010-12-21 Method of producing a silicone oil composition WO2011078396A1 (en)

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